方钢管混凝土柱与工字钢梁竖向加劲式节点拟静力试验研究

Quasi-static Test on Connections with Vertical Stiffener Between Square Concrete Filled Steel Tube Columns and Steel Beams

为了解方钢管混凝土柱-工字钢梁竖向加劲肋式节点的抗震性能,对两个方钢管混凝土柱-工字钢梁竖向加劲肋式节点试件进行了拟静力加载试验,研究了节点在反复循环荷载作用下的滞回性能、耗能能力、延性、应力分布和传力机制.试验结果表明,节点具有足够的承载力以及较好的延性和耗能能力,竖向加劲肋式节点的梁端弯矩大部分通过竖向加劲肋传递给柱钢管腹板和核心混凝土,另一部分梁端弯矩由梁端翼缘直接传递给柱钢管翼缘和核心混凝土.节点破坏模式为靠近竖向加劲肋端部的梁翼缘出现严重的局部屈曲,梁翼缘变截面最窄处形成塑性铰,而柱钢管、竖向加劲肋、梁端部均在弹性范围内工作,很好地实现了强柱弱梁、强节点弱构件的抗震原则.

In order to study the seismic behavior of the vertical stiffener connections between square concrete filled steel tube columns and H shape steel beams. The quasi-static test on two vertical stiffener connections between square concrete filled steel tube columns and H shape steel beams was carried out. The hysteretic behavior, energy dissipation capacity, ductility, stress distribution and force transfer mechanism of the joints under the low cycle reverse loads were researched. The results indicate that the joints have enough carrying capacity, better ductility and energy dissipation behaviors. Most of end moments of beams are transformed to the column web and the core concrete at the panel zone by the vertical stiffener connected to the column web. Others are directly transformed to the column flange and the core concrete. Serious buckle is occurred in beam flange near the end of vertical stiffener and plastic are formed at the narrowest beam flange when the specimens are failure. But the columns, vertical stiffener and the end of beam flange are in elastic. The principle of strong column week beam and strong joint week member are well achieved.